cement for DIY rocks

[Reefer Rob]

Originally Posted by Kronk

I am goign to be making up a batch of DIY rocks soon and I am wondering why Oyster Shells? Is it just for the texture or does it help by adding calciuim?

By the way Buckerfields right off #1 Hwy in Abbotsford has crushed oyster shells in Bulk.

Oyster shells are just to add texture. I used aquarium gravel in mine, but I think oyster shells would give a coarser look.